Simplest way to download and unzip files in Node.js cross-platform?

Question

Just looking for a simple solution to downloading and unzipping .zip or .tar.gz files in Node.js on any operating system.

Not sure if this

Answer 1

I was looking forward this for a long time, and found no simple working example, but based on these answers I created the downloadAndUnzip() function.

The usage is quite simple:

downloadAndUnzip('http://your-domain.com/archive.zip', 'yourfile.xml')
    .then(function (data) {
        console.log(data); // unzipped content of yourfile.xml in root of archive.zip
    })
    .catch(function (err) {
        console.error(err);
    });

And here is the declaration:

var AdmZip = require('adm-zip');
var request = require('request');

var downloadAndUnzip = function (url, fileName) {

    /**
     * Download a file
     * 
     * @param url
     */
    var download = function (url) {
        return new Promise(function (resolve, reject) {
            request({
                url: url,
                method: 'GET',
                encoding: null
            }, function (err, response, body) {
                if (err) {
                    return reject(err);
                }
                resolve(body);
            });
        });
    };

    /**
     * Unzip a Buffer
     * 
     * @param buffer
     * @returns {Promise}
     */
    var unzip = function (buffer) {
        return new Promise(function (resolve, reject) {

            var resolved = false;

            var zip = new AdmZip(buffer);
            var zipEntries = zip.getEntries(); // an array of ZipEntry records

            zipEntries.forEach(function (zipEntry) {
                if (zipEntry.entryName == fileName) {
                    resolved = true;
                    resolve(zipEntry.getData().toString('utf8'));
                }
            });

            if (!resolved) {
                reject(new Error('No file found in archive: ' + fileName));
            }
        });
    };


    return download(url)
        .then(unzip);
};